Hand Grips の説明 from Pro Source
ProSource Gymnastic Hand Grips are a versatile cross-training accessory, functional for everything from gymnastics to CrossFit. The leather palms provide a better grip and strong protection for your hands so you can extend your workout and give it your all, without worry about ripping callouses. They are designed for both comfort and durability for repetitive swinging and lifting. Heavy duty stitching makes these hand grips long lasting for frequent workouts, and simple Velcro straps make them easy to get on and off.